In several species of " Hypocnemis " antbirds, acoustic signals function in both intrasexual competition and mate choice.
12.
Condition-dependent behavior in the context of mating may result from changes in resource availability and intrasexual competition for mates.
13.
Ornamentation is important in female intrasexual competition, which involves female-female competition for potential mates and their associated resources.
14.
There is evidence that long songs have been evolved through intersexual selection, whereas short songs have been evolved through intrasexual selection.
15.
Antbird songs, which are sexually monomorphic ornaments, function as deterrents in competitive intrasexual interactions as well as in mate choice.
16.
In most species, only the males are colorful, supporting the theory that the coloration is used for intrasexual communication between males.
17.
In the case of " intrasexual selection ", adorned males may gain a reproductive advantage without the intervention of female preference.
18.
It has been shown that when women at their peak fertility, they will have an increased awareness and sensitivity to female intrasexual competition.
19.
The crests were categorized as full ( male ) or narrow ( female ) and may have given some advantage in intrasexual mating-competition.
20.
American marten male pelts often show signs of scarring on the head and shoulders, suggesting intrasexual aggression that may be related to home range maintenance.
